Forebrain E-I balance controlled in cognition through coordinated inhibition and inhibitory transcriptome mechanism

Area of Science:

• Neuroscience
• Molecular Biology

Background:

• Forebrain neural networks are essential for cognitive functions.
• Excitatory-inhibitory (E-I) balance, governed by neural homeostasis, is critical for cognition.
• Mechanisms maintaining forebrain E-I balance and cognition are not fully understood.

Purpose of the Study:

• To investigate neural network homeostasis strategies.
• To identify transcriptomic mechanisms regulating forebrain E-I balance.
• To explore the impact of suppressed excitatory activity and spatial training on E-I balance.

Main Methods:

• Patch-clamp electrophysiology to assess neural activity.
• RNA sequencing to analyze gene expression patterns.
• Utilized tamoxifen-inducible Kir2.1 conditional knock-in mice to suppress excitatory activity.

Main Results:

• Suppressed forebrain excitatory activity reduced inhibitory transmission and receptor transcription.
• Spatial training increased inhibitory synaptic connections.
• Spatial training upregulated the transcription of inhibitory receptors.

Conclusions:

• Inhibitory systems are vital for homeostatic control of forebrain E-I balance.
• Cognitive training influences E-I rebalancing through modulation of inhibitory systems.
• Identified potential gene candidates involved in cognition-related forebrain homeostasis.